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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f15ce075a164ed711d8b3ca39b69f236b755e214df8594015550deb4de090e0' 
  AND token = 'Ly1ZJBA3KdObzjt5EfT3A+6wZP3oHHYwAsLWueiohLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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