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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaef6f72e61bfec36e4a7277a32e8f7d4f097d67511a48b1496fd008fd137d6a' 
  AND token = 'HfIFWzImOplVDgmX9iW9ZTnbCcugriqgFX+PN1xtWuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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