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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bdc9593717d46e8fbe31433100df4966a1ef8ae3fb943657dedd658b6e4da45' 
  AND token = 'NJ6MYayOUg78VeA6Jol3VAR39jHd0wgFnmLwOgSkoSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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