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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36c2d591ce3b446042b27050dbce28feae95e263f0149f2b28573e77e219eeb8' 
  AND token = 'YILBLzjSLSicdD7uF0Rj1zljnrkTwAx8yMrrtyrk6jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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