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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1c9675d9dd74bbdad78d06bc79a7df33cb6421d0283dc63fb872d12a3922d9a' 
  AND token = 'hPdmoVwPzagq08gjeqnNdjlReYmojK9NDvRgqm83XQE=' 
  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"
    }
  }
}