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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84c365f0d47f61c6c1970e65e8921d411fd87d07c8fc8a1d87ba42fb5c0e9915' 
  AND token = '9yTeWyhq10NZ4hjjtuCHcEhd6OGNkwXnVLCbxZWewzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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