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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5afb6b10e81ccf4d528dd5b6a4288fcc91c6ea333c15ea30b5207d0e2f609cf3' 
  AND token = 'zuIJ3+uVLB33sDVu2c5j0LD6c5ymU9fZDiCk9hyDd2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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