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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c84c9e2f438e9ff43eb936017ad6a26ebec3d26c7e2f0336aeeaf4d0fa0e536b' 
  AND token = 'L2CQuL6jxZawOrHaK904UNvMZ5N18DOXLL8NO0Z36Kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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