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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa82d7da05a6e00a3cf57b7a7e81aac87c56fc1dbeb31fc84e34124b4786bbfa' 
  AND token = 'iuj/MrBG/ue3mrmIcYTd4I2uDr6S9izvzZc7GQ1fYD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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