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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee68f3abbc60f57fcec3bda9017443f29a98cb06980d6b1530dd7261a874ed80' 
  AND token = 'MwoU06esst03G2FULkfp8dP7RdviccVLg3W4Eic+1uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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