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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ebc57d671da1b123ca6359cbbf572b568bed89f7bf0866dcbafd220cb70c2fa' 
  AND token = 'o76nD9abomGWL9MXv+0pfaliNcfoGmXPA7vbw/SyXAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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