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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8bbe8e0e070c9a40e3f3d08ed41be2a38411dfcef698ca4d7d95a7e30e5eda0' 
  AND token = 'R/OrnPT4hbhFyqqTLO7VXwR+dif4MVD7OGniF2UPo5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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