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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6006b15709ee54fd1cab38cabfca88b114c619ffaaf28bfd696547a4b5d0ffcb' 
  AND token = 'xEIy3yzs817x2yV7wW4NqgnaCdNpWps0nmoh37ZSjoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}