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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6317256a886d6e48f7563da032d8a209db7da3855ff3c5a0ce9848e43059494' 
  AND token = 'zmpWz5xs9GGyV/5bj/d1263wefbwdsqGtn4rPwVlqsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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