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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7434dd4b474185f3014e445cbb2c57b611bbad32c4e4c5783eda458c4b76de4a' 
  AND token = 'ZaeQ0p9y7SEB1FrNJ/CK9qJC1qYOdqbWaDikEg0N6yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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