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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '447b2a1aaad235a0379e56c6e84082cc114b4b7404c044ee1e583441b4c8ca46' 
  AND token = '/Bz6G382s53jSi8BjChz9Asg+NzrPrETGZsba/STKK8=' 
  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"
    }
  }
}