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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b9b528ff72bf3cacfce0abd59f08c5ac18a8cf30cd3a2caf1da79887a77aa57' 
  AND token = 'oD2EjfK91foBx12EIU/+zy/yZgEGAk1epV0CEbdtkeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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