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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4751984134c4b743c75b342082c9773c76e78c7e87083aa13b6a67d8ff900d53' 
  AND token = 'M0J82lSHIuO4SFIEW67DZcXw5WU5F8VBVsEdTVWdcZE=' 
  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"
    }
  }
}