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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3576dd6f05f203fdb1109b138f4310f4b2af1f510f9799744671e64d09048163' 
  AND token = 'fTfO/2AOKH3iks2yDP4aMo7KzrkiFAJQrXaJr3MDV08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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