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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4936a8809a0c22ab80e696f609c4d7c32f1d1affaca11598d20b8a8e9a7c038d' 
  AND token = 'Bo7V7Gfiwti773a7eOAlR06R59Q2EleHP2Fp0DzqrOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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