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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd4567ac092ff7156d18579acdf0e3d48e596a33084233813ac9461ebd8b8818' 
  AND token = '34wucONy0evIJZlr7Wt076U+JIoBL/piWbKFO0eR258=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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