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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9f11e1d640f9297b48a9b80e2927b2692f8f00578d9a59ca2ed9e0ff230eae2' 
  AND token = 'm7vyLqDIyZXcrsX123B/cVgZap423jAMczxxrJ1kTI8=' 
  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"
    }
  }
}