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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e58cf6884346bc78db8ba22665f21a03b6e6f659114d5e4978a9d1c3b48bbe9' 
  AND token = '8wmDugWncGkbo0L8v00QH4Lmatv1HqhY94Ma0mJJqrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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