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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb51816ba55986e620b0a2589a23400a433f50cb7aade3f2baf9424d4dead854' 
  AND token = 'MgtYR1aqEct8Tkze0MBJGs0Unyn7L7U9Mqf6J2CoIEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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