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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd38e6b6463a095f04c88ce5ac224450133bda3fe9bce4f714f80f119242443b7' 
  AND token = 'Z1Tl8W2Kh/Lomd6DUcNxaQ1rUeynjYl6ppequLyfnOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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