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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a83cae71c9b8f1785026ef26e83613fb2d3a21de1cf9e91cb9467e7aff9875b' 
  AND token = 'lzGsNjfT3Oi8EsM4S4KzetISjPb+CJhrZ7ziydkhx0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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