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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4a582fcade43f75e4e8716abb068aa2838d7bbcb53e18b7462c1a34b7722f1e' 
  AND token = 'E1efsTvPPCQmj2b/5FKMgVmiHXfuonp09uFGfjLj1oE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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