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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7628315b211439ac5805238d734d3a175306d8b07c5e205e4e1c1178df67d7a3' 
  AND token = 'Wf+SeJe/Mz0eOvcrr/LrdWuwzgNnqttpY9qt6mN8pnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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