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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dd11364985f405bad8cab137e13909c52e5c350af81e2861fa767f9ef182e20' 
  AND token = 'N2SdH3EVkbi+v7N+FTt9aeVlTV0hXCbdZCUgmYl2i4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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