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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10754685f001f2b53b8847a6d93e9f5d424ebca3f4ae3c533b0f8a498f0a9259' 
  AND token = 'R70V3ThgNenALd5EqCfHyBakp/2i+/9hpLsIOJMrSfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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