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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cf4f5a9b992fb2859603accd16b8358bc2f357517d06a0ef5b194363d309484' 
  AND token = '9K+JRFyr4B7XccJQvMD9NhYynllx1I9QR+9W5lFvYUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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