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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e17d7d411a2a245cc7432e578e3c0bdc74c094429af316c2725007cb1e731afb' 
  AND token = '3LusxdnCwZqznsP/2oKP1A4YcXagvXeN2GHYBfQu8jY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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