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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46b2f1629be850169ea9e545895acd03be677dfe1fec4a8ff817bdd925b64023' 
  AND token = 'OHst3HT9nhBZbWB7uSD/PCmfyfSk6uuHkROxcsRDfK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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