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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df5cc3d246f8048d1c189fdc381d13e628c0980bae4c45e9f002dc5bbf622c93' 
  AND token = 'y2O2NjtBsO6QQ87ybI10u2TG9kLQar+OzXHepggSSKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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