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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c3bb2fed6a49717bccfcd669350e799e2512ddc6fab335f7fd12d205d5791fa' 
  AND token = '2qUerI2fBbaaHwbEkXLmsFnT2qag6nka7Wmu+t0c/v8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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