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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89f0175e5048725238405e7db5038b298f880301fdf8131b436447b2b82bbc49' 
  AND token = 'vG7m08/i8SitIahPekE4qTCM/UqViqijX8qyhFEWiQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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