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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7d71aa56a4513d11489ea69b45cfd746497eb59cac828de4e75ec2ff6b288cf' 
  AND token = 'UFYSb5a+S4eLVPMH81QTL4w11h6gVyoM+scG1eSp+JU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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