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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fde5fec20367ad0145e08d75496ade3e4ff559a0fe0a721e6fbe9a7f79f7be87' 
  AND token = 'Ojf1UhLhEf3A/0xzgg/VmLI63hUMMt4xeLQ97Pdbp2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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