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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f84ee1cb2f958bf9c5c23de140dc2c4ec0fd35a50236835481b4de43ee69f94' 
  AND token = 'uUl0WnA3AZ7v/XzQHfknH+DtPfuaNZVjnzyIsNrkKqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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