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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40b2692042ef7fcf9f63bce11bceb7dfadf9f829b430ade580899c9a74136e4c' 
  AND token = 'rfXc8GadcG8DAD+gKnLF3kx5mJyHq8zoOdE5J+eqB8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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