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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84d6b7946b77ae9fe1e96c6ce933bb3a99c04c67d05cabff319aa836d51f944b' 
  AND token = 'P6Wngvr0vo9e6wzxz5ngr9XzNWBY8PQOlmBILoQy9WA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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