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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0164eed9717ee0cc337e0381c054e9e0bd78d904131dce7eb5d6c4bea765ee8' 
  AND token = 'TxC5u7etzNrTgUzs+h9ZUpmdDh5y24ezePfp+IXWGaw=' 
  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"
    }
  }
}