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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7486402a57c56ace7da4985e5dc9d0f3c1af39ccb98fa65fb0407b1a2b930634' 
  AND token = 'LGEb+3h40G81KhZu0mxKId4uMWyHaIbHUXNQa2gGF+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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