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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59a7a6251cd4fa6ffb0c1bfbbe4c9f05aeb077f2e4c1842cab08d49680831553' 
  AND token = 'sI/pORcl7ta1s/3hY+oSO3C/hBP79MGE2vvCQpd8/ds=' 
  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"
    }
  }
}