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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f1067fe61b8c3bb569dec06f32f9bd88c7b4d87e4ff9dc63d70f7832eaceec9' 
  AND token = '6/u3UZfXNoeKhsNmwlUDs/o/Gn3rZXNsBA3JCh+D4KU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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