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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c6d641a114420932a0e2ed19528584083347c41903caebc7d10056ac28c06d7' 
  AND token = 'gJzx6rctW1C8Gg249Ss8a1c2P54EEJa3edi0GO23MPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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