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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00e62633aaf3766b18db322e49cd182502ccee92c722902d5a0ea4b8345c44a4' 
  AND token = '+g89kUhu1c0ZzX5ycubrjv3MSq2XqhXrJ8MNJKjBGlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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