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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7d1f912e9ed6a5618e80b18914c8a50df09a5686677ca1e9da0bcd565f63f83' 
  AND token = '56aR4tfO6a1YF1Z942zrHaT+uKt8JW7+cPwgjUt6Wj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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