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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f570cce3c18fe5e57855adb423b018367cede75a9a2e3ce0c4cb5507dda9a700' 
  AND token = '9MYkvdvCqEXdrr0WEy4rlN1x6w43E5cIEC23dI4XZ9Q=' 
  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"
    }
  }
}