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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04bce01caa1a9bfc083d590a3d191c9a14ffb45ae01de9dc69cc2ca148d8e5a5' 
  AND token = 'gP3zvU+KeT0VQAXAg7PT3NN0DL2RoISvQOrM75vuiv8=' 
  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"
    }
  }
}