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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '482f02394f2094c4f80b0ac7f04ac66b01ce909b45f20c07b87533058e3a8e10' 
  AND token = '4zaGTwEA3QiHdgbML4eIDHNzVyD6wEGldo3oSbSQ4Rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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