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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adf8454523b258bb77e31e3676676652f1ebfbf4ade8315e672530b6cd9a3a54' 
  AND token = 'yTO17WQWkkJmI24HJLmLHM4P4HnGPK/isE7frJM3m88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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