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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2d8939e4b339a26473fa9e503c80f15fad020e45141e9eca7a8dd6c0bdbaa51' 
  AND token = 'yVXfvo6KOXW3kKeLqPk2e2+n8EfoV5FxgC1HVCd3T2o=' 
  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"
    }
  }
}