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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02b00cded29a815db4d58db33d4fad3391ad8de1c525cd4a0b298b2356cafb6f' 
  AND token = 'nlBY/k1ZOPCgvetNsgdrv6yB6FZH3IsAykxGeSUyEps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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