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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e5e144ad7a76b7ec7ce1063930a792022b07e995859820e63e4e164ee5f2d10' 
  AND token = 'gDLfwpzrKky48lCBWP8sHAhMwLOnZlbT/6tQw+y7QUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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