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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5908d838f0ee777066484f15b0dbd07f7346042b9eceaec6b10a93bd5087ffeb' 
  AND token = 'SK9e1lLMY6E4zyINpz57WMUhAtZRc9PoN6tROWwBrV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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