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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c708980d4eb87b948a6a48c47ef7ab9cb20bac2bc77e970df063fd5aaf81b4c8' 
  AND token = 'u3BaAhQkytHhDIqLidb4W82sQM/wo0adGDMvc2YVBoQ=' 
  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"
    }
  }
}