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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35b061400becf60dfe20b8f52106be57b0ad6de42d4ff38c788b0769ec366166' 
  AND token = 'ZJQj2A43aSpXsql8psqbWcRyXE/2/99DUJne/Vot5uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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