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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eca49c3441225da32c2facfd7dc7391903a02462df29fe5a9a0659741dcac26' 
  AND token = 'cRSsVPo2tX7kliT6ChinisEMeVy99M+2mTo1DMJvNRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00124

JSON explain

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