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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df285143bfbe550e65b5cc8dcdc5cef7cb40b1cf4d9e48891b7e2817ef6f4d31' 
  AND token = 'y3UpJLpQeyuoeZtU3xfO6d68JEFlqOQpo9IYiNFHAu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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