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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e5de8f0d25d7626f7950afedb68f4ca25463bb20d21b5a80a946e254c24d1bf' 
  AND token = 'KF0i13Te7ayqX4vO/xAFEN3LGYgwZf7TH06T+7wC1Bs=' 
  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"
    }
  }
}