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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3aeebeff3d3e72890e6f959e5a12d669f285ae7ff081668c4013d152f0ca899' 
  AND token = 'WSxzm6KJKamL+1Ix9tRnrv/TInOpIEGbg3W20zhMJbQ=' 
  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"
    }
  }
}