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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d0e4f39f553c0cb6aae54fee99ebfec2e20cbc9a97e9f3ec54435600f23be0d' 
  AND token = 'Rp4mh+F1yaekDRuPr2v70Y1pk+T6VE8e1F1OkiGw0pI=' 
  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"
    }
  }
}